Welt indenting machine



-5 Sheets-Sheet l Filed July 27, 1949 nvenfar A Cor'wa'n WBa/{er NOV.13, 1951 Q W BAKER WELT INDETIN'G MACHINE 5 Sheets-Sheet 2 Filed July27, 1949 yInl/@7150?" Corwin WEGA/er- Nov. 13, 1951 c. w` BAKER2,574,611

WELT INDENTING MACHINE 5 Sheets-Sheet 5 Nov. 13, 1 951 Q M -BAKER2,574,611

WELT INDENTING MACHINE Filed July 27, 1949 5 sheets-sheet 4 30 28wsu-mm1 Nv. 13, 1951 CJW. BAKER WELT INDENTING MACHINE- Fl'iled Jllly27, 1949 E911.

5 Sheets-Sheet 5 Invenfo' Corwin, WBa/er Patented Nov. 13, 1951UNITED-STATES PATENT OFFICE 6 Claims. vl

This invention relates to 'welt-'indenting machines and is hereindisclosed as embodied in 'a granted September 7'26, '11944 upon therapplication of 'Irving E. Booth. fSu'ch machines are in common -use formaking "inzien-tations to form a uniform decorative design "uponA thewelts of shoes or upon the upper surfaces ci the projecting margins ofthe soles of shoes which are not provided with welts. In 'a machine ofthis type the Aoperating instrumentality. consists of a frusto-con'caltoothed Wheel 'which is vfreely and idly rotatable and which is urgedperiodically againstl the Work 'piece by a crank and linkage mechanism;and the work support consists of a driven turntable which may beAadjusted to any desired position in the direction or feed and toy anydesired angle of inclination, the work support being yieldingly *held-'against the pressure of the 'indenting wheel by a spring and being alsomomentarily supported against the rapid impulses of the indenting wheelby van inertia block. Y

It is an object of the ,present invention to provide av Welt inden'tingmachine of the type Iunder consideration having a simplified operatingmechanism. In accordancey with this object, the mechanism for operatingthe 'indenting wheel of the illustrated machine consists ofv aconnecting rod which carries the in'denting tool and which, is driven bya crank, the connecting rod being fulcrum-ed upon 'a pivotal' supportcarried by a 'free end `of a guidelink the opposite end of which ispivotally mountedior swinging movement about a `stationary pivot. Theindentin'g Wheel, by reason of this construction, is free from theArotational frictional drag to which it would b-e subject vii mounteddirectly upon the crank. In accordance with another feature, the crankwhich drives the connecting rod. comprises a crank pin carried by aneccentric lwhich may be rotated for purpose of adjustment with respectto a shaft, which carries the eccentric, such adjustment serving to varythe throw of the crank pin about the axis of the shaft'. The amplitudeof the impulses imparted to the indenting wheel by the crank pin can` bevaried by this adjustment. Y

These and other features of the invention Will appear more fully fromthe following detailed description when read in connection with thedrawings and win be lpointed out in the appended;

claims.

Fig. 1 is a side elevation of 'an illustrative machine embodying theinvention;

Fig. 2 is a side elevation, on a larger scale, of the upper portion ofthe machine shown in Figl;

Fig. 3 is a sectional side elevation drawn on a still larger scaleshowing the operating and Work supporting instrumentalities in engage-`ment with a shoe;

Fig. 4 is a View in perspective of the forepart of a shoe showing theindentations formed in. the welt by the illustratedl machine;

Fig. 5 is a front elevation of the upper portion of the machine;

Fig. 6 is a iront elevation ofthe mechanism fo'r driving the indentingWheel adjusted for zero throw of the crank pin;

Fig. '7 is a view similar t'o-Fig. 6 adjusted for maximum throw of thecrank pin;

Fig. 8 isa detail ksectional view of the indenting wheel and itsmounting;

Fig. 9 is a front velevation of the treadle mechanism;

Fig. l0 is a sectional view taken on the line X--X 0f Fig. 2;

Fig. '11 is an exploded view of the Worktable and its supportingmechanism; and

Fig. 1'2 is a detail in front elevation, partly in section, of some ofthe parts shown in Fig. 1l.

The work-engaging members of the illustrated machine consist of airusto-conical toothed indenting wheel IU, a guard I2 for protecting theupper of a shoe S (Fig. 3) from the Wheel ID V and 'serving also as agauge against which the upper of the shoe is held, and a rotary drivenworktab'le I4 for supporting the shoe. The indentations formed by theindenting wheel i@ upon the Welt of the shoe S are shown in Fig. 4.

The supporting structure of the machine consists of a column I6 whichcarries a head or frame having a base I8, a front Wall 20, a rearl Wall22, and a cover 24.

The indenting Wheel Ill is mounted for free rotation upon a pin 26(Figs. 3, 6, 7 and 8) to the' ing rod "352 by a washer '3u on the pin2e. The upper end portion of theV connecting rod 32 is in the form of'an eccentric strap 33 and it carries the outer rac'evvay of a balibearing 34 (Fig. 3), the inner racevvay ci ,which is mounted upon theforward end portion oi a crank pin 35. The crankl 313, upon'w'hich theconnecting rod -32 is thus journaled, is secured in an eccentric boreformed in a sleeve 38 which is secured in an eccentric bore formed inthe forward end of a shaft 40. A set screw 42 holds the eccentric sleeve38 in any desired position of rotary adjustment with respect to theshaft 40 and a set screw 44 holds the crank pin 36 securely in the boreof the eccentric sleeve 38. The inner raceway of the ball bearing 34 isretained against axial movement on the crank pin 36 by the forward faceof a flange on the eccentric sleeve 38 and also by a washer 46 which isclamped by a nut 48 against a shoulder on the crank pin.

The shaft 49 is journaled at its forward end portion in a bearing 50carried by the front wall 20 and its rear end portion in a bearing 52carried by the rear wall 22. Upon a rearward extension of the shaft 40is a pulley 54 which is driven by a belt 56 from a pulley 58 (Fig. l) onthe shaft of a motor 60. The shaft 40 is thus driven in acounterclockwise direction, as seen from the front of the machine.

For controlling the motion of the connecting rod 32, there is provided afulcrum in the form of a pivot pin 62 (Figs. 6 and '7) located at anlintermediate portion of the connecting rod between the indenting wheel Iand the crank pin 36. The pivot pin 62 constitutes a pivotal connectionbetween the connecting rod and the lefthand end of a guide link 64, theright-hand end of this link being pivotally mounted upon a stationarypin 66 secured in the front wall 20. It is evident that rotation of theshaft 40 will rock the connecting rod 32 about the fulcrum 62 and thatthe link 64 will swing up and down to permit the connecting rod to moveheightwise, the lateral displacement of the fulcrum 62 being negligible.An arcuate slot 61 formed in the connecting rod 32 and centered aboutthe pin 66 (when the connecting rod is at the mid-point of its stroke)enables'the pivot pin 62 to be adjusted up or down to vary the length ofstroke in the direction of feed. The effect of rotary ad- J'ustment ofthe eccentric sleeve 38 is shown in Figs. 6 and 7. Fig. 6 shows thesleeve 38 as hav- Ing been turned into a position wherein th-e axis ofthe crank pin 36 coincides with the axis of the shaft 4.6 and with thisadjustment the connecting rod 32 will be motionless. Fig. '7 shows theeccentric sleeve 38 adjusted for a maximum stroke of the crank pin 36 inwhich adjustmenI the indenting wheel I0 will be driven in an orbitalpath and will thus be urged periodically toward and from the work andalso rolled along the surface of the work back and forth along the pathof feed. The maximum eccentricity provided by adjustment of theeccentric 38 is sie. and the maximum diameter of the path of movement ofthe indenting tool I0 is about als when the pin 62 is adjusted in theslot 6'! to a point midway between the crank pin 36 and the indentlngtool I0. The indenting tool is heated by a stationary gas jet 68 whichdirects a llame against a rearwardly extending end portion of the pin26.

The worktable I4 is carried upon the forward end of a yoke-shapedbracket comprising a pair of parallel arms 'I0 which incline upwardlyand rearwardly from an integral cross bar 12. The arms 'I0 embrace thecolumn I6 and also the base plate I8 and their rear ends are pivotallymounted upon a pair of coaxial pins 'I4 secured in ears 'I6 on the endsof a cross bar 'I5 clamped by screws 'I'I to the base plate I8.Extending upwardly from each of the arms 'I0 is a lug 18.

These lugs 18 slidingly engage the lateral edges of the base plate I6 toguide and steady the arms I0 in their rising and falling movements.Extending between the lugs 'I8 is an integral cross piece 80 throughwhich is upwardly threaded a stop screw 82. A lock nut 84 holds the stopscrew 82 in adjusted position. The upper end of the screw 82 engages theunder surface of the base plate I8 to limit the upward movement of thearms 10 and, therefore, of the worktable I4.

The worktable I4 is supported by a treadle mechanism which is connectedto the cross bar I2 by a fitting having a downwardly extending ear 86(Figs. 2 and 3) and a horizontal flange 88.

A pair of clamping screws secure the ange 88 to an offset centralportion 9| (Fig. '11) of the cross bar 12. A pin 92 pivotally connectsthe ear 86 to a downwardly extending rod 94 having a threaded lowerportion 96 upon which is threaded a sleeve 98 having at its upper end anintegral knurled disk |00 to facilitate upward and downward adjustmentof the sleeve 98 upon the rod 94. A lock nut |02 holds the sleeve 98 inadjusted position. Slidably engaging the outer surface of the sleeve 98is a heavy inertia block |04 which extends down below the sleeve 98 andwhich has a downwardly extending bore coaxial with the sleeve 98. Theupper end portion of a rod |06 slidably engages this bore. Secured uponthe rod |06 by a set screw |08 below the inertia block |04 is a collarIIO. A coil compression spring ||2 surrounding the rod |06 has its lowerend resting upon the collar I I0 and its upper end in engagementwith theunder surface of the block |04 to support the block yieldingly. Thelower end of the rod |06 (Fig. l) is pivotally connected by a pin I|4 toan arm I6 which extends up from a fulcrum pin |I8 upon which it ispivotally mounted. Integral with the arm I I6 and extending forwardtherefrom is a treadle |20. A tension spring |22 having one end anchoredupon a stationary post |24 and its other end secured to the arm IISnormally holds the arm |I6 upright against stop screw |26 threadedthrough a stationary portion of the machine frame. It is evident fromthe foregoing description that the arm I|6 and the rod |06 togetherconstitute a toggle which is normally held in straight position by thespring |22 to support the inertia block |04 and the worktable I4 inworking position. This toggle can be broken by depressing the treadle|20, thereby permitting the inertia block and with it the worktable I4to descend under the inuence of their own weight. The purpose oflowering the worktable I4 is to facilitate the introduction of a workpiece.

The worktable I4 consists of a rotary disk having a stem |28 (Figs. 3and 11) extending down through a bearing block |30. 'Ihe lower portionof this bearing block |30 is in the form of a dovetail arcuate slide |32having for its axis of curvature a line tangent to the periphery of theupper surface of the worktable I4 and perpendicular to the axis of theindenting wheel I0. Formed upon the slide |32 are rack teeth |34` Apinion |36, which is integral with a shaft |38, engages the rack |34 tovary the angular adjustment of the worktable I4. The shaft |38 isjournaled for rotation in a block |40 and has at one end a knurled head|42 to facilitate turning. The block I 40 has an arcuate dovetailguideway in which the -slide |32 is slidable. A similar. arrangement foradjusting the angular position of the worktable is disclosed in UnitedStates Letters Patint No. 1,357,511, granted November 2, 1920, upon theapplication ofFrederick- Perry; Theblock` |40 has alsol a dependingdovetail |44 which isslidably mounted for 'purposes of transverse (i.e., in the direction of feedof the work) adjustment in a complementalgroove formed in a pair of parallel walls |46 which connect the offset9| to the main portion ofthe? cross bar 12; Adjustment of the dovetail|44 to bring the axis of the` worktable I4 to the left of the center ofthe guard |2 will cause the rotating worktable to exert a component ofcrossV feed which holds the upper of the shoe against the guard, themagnitude of this component depending upon the' extent of theadjustment. A kerf' |48 is cut into the walls |46 tov provide forclamping and unclamping.r of: the d'o'v'etail |44'. A pair of screws |50serve to` clamp the. dovetail |44 inv its adjusted position.

"The stem |28 has a downward extension |52 of reduced diameter whichpasses down through a slot |54 formed in the block |40. The lower end ofthe extension |52 is connected by a universal joint |56 to the upper endof a drive shaft |58 (Fig. 2). The lower portion of the drive shaft |58is slidably keyed to a telescopic sleeve |60 which itself is keyed to adrive shaft |62 (Fig. 1). The lower end of the drive shaft |62 isconnected by a universal joint |64 to the upper end of a shaft |66 whichis driven through reduction gearing |68 by a pulley |10 and belt |12from a pulley |14 driven by the motor 60.

In operating the machine, the operator lowers the worktable I4 bydepressing the treadle |20 and he then inserts the projecting margin ofthe sole of the shoe S between the indenting tool I0 and the worktable|4. Upon his release of the treadle |20, the spring |22 draws the arm||6 inwardly and straightens the toggle formed by the arm 6 and the rod|06. The Worktable i4 is thus, except for the spring 2, supportedrigidly. The spring I2 yields to accommodate soles of differentthicknesses and also local variations of thickness in the same sole; theinertia block |04 however does not yield quickly enough to respond tothe rapid individual movements of the indenting tool I0 and so far asthese movements are concerned it may be considered as affording astationary support to the work piece. The crank pin 36 causes the upperend of the connecting rod 32 to move in a circular path and thepivotally mounted link 64 constrains the movement of the fulcrum pin 62to a linear path which, because of its small amplitude, may beconsidered as substantially straight. The linear movement of the fulcrumand the oscillatory movement of the connecting rod about the fulcrumprovide two components of motion for the indenting tool, the resultantof which components is an orbital movement in a clockwise direction asseen in Figs. 5, 6 and 7. The amplitude of this movement is never greatenough to raise the teeth of the indenting Wheel I0 out of contact withthe work and it is too rapid to permit the spring 2 to force the inertiablock |04 up each time the indenting tool I0 is raised. The teeth of theindenting tool I0, as the indenting tool is retracted, are innon-slipping engagement with the Work and the new indentations formed bythe advance stroke of the indenting tool will therefore be in registerwith the indentations already formed. The movement of the indenting toolback and forth along the line of feed is so rapid as to insure the teethre-entering several timesv the already formed indentations anddeepeningnthem. An advantage in mounting the indenting tool upon theconnecting rod 32 rather than directly upon the crank pin V36 is thatthe frictional effect of the rapidly rotating crank pinl is nottransmitted to cause undesired rotation of' the indenting tool.

Having described my invention, what I claim is new andv desire to secureby Letters Patent of the United States is:

1. In a weltindenting machine, an indenting tool and mechanism forimparting to said indenting tool an orbital motion, said mechanismcomprising a driven shaft, xed 'bearings in which said shaft i'sjournaled, an eccentric driving member'on the shaft, a connecting rodjournaled upon and driven by the driving member and carrying theindenting tool, a fulcrum about which the driving member rocks theconnecting rod to impart to the indenting tool an oscillatory componentof motion along the surface of a work piece,`

and means associated with the fulcrum for enabling the driving member tomove the connecting rod toward and from the work piece and therebyimpart to the indenting tool a periodically reversing component normalto the surface of the work piece.

2. In a Welt indenting machine, an indenting tool and mechanism forimparting to said indenting tool an orbital motion, said mechanismcomprising a driven shaft, an eccentric driving member on the shaft, aconnecting rod carrying the indenting tool and having a bearing on theeccentric driving member whereby the connecting rod is driven, a movablefulcrum upon which the connecting rod is pivotally mounted, and meansfor constraining the movement of said fulcrum to a linear path, thelinear movement of the fulcrurn and the oscillatory movement of theconnecting rod about the fulcrum thus providing two components of motionfor the indenting tool, which components are compounded into an orbitalmotion.

3. In a welt indenting machine, an indenting tool and mechanism forimparting to said indenting tool an orbital motion, said mechanismcomprising a driven shaft, an eccentric driving member on the shaft, aconnecting rod carrying the indenting tool and having a bearing on theeccentric driving member whereby the connecting rod is driven, a guidelink, a pivotal support for one end of the guide link, and a pivotalconnection between the other end of the guide link and the connectingrod to serve as a fulcrum about which the connecting rod can swing as itis driven by the eccentric driving member.

4. In a welt'indenting machine, an indenting tool and mechanism forimparting to said indenting tool an orbital motion, said mechanismcomprising a driven shaft, an eccentric driving member on the shaft, aconnecting rod carrying the indenting tool and having a bearing on theeccentric driving member whereby the connecting rod is driven, a guidelink, a pivotal support for one end of the guide link, and a pivot pinat the other end of the guide link for pivotally connecting the guidelink and the connecting rod, said connecting rod having a slot in whichsaid pivot pin can be secured in various positions of adjustment to varythe radial distance of the pivot pin from the axis of the driven shaftand thereby to vary the orbital path of the indenting tool.

5. In a welt indenting machine, an indenting tool and mechanism forimparting to said indenting tool a'periodicmotion, said mechanismcomprising a driven shaft, an eccentric carried by said shaft androtatable with respect thereto for the purpose of adjustment. means forholding the eccentric in adjusted position, a crank pin carried by theeccentric and having its axis offset from the axis of the eccentricwhereby rotary adjustment of the eccentric will vary the throw of thecrank pin about the axis of the shaft, and means for transmittingmovement from the crank pin t0 the indenting tool.

6. In a welt indenting machine, an indenting tool and mechanism forimparting to said tool a periodic motion, said mechanism comprising a 10driven shaft having an eccentric bore in one of its ends, an eccentricmounted insaid bore and rotatable therein for the purpose of adjustment,means for holding said eccentric in adjusted position, a crank pincarried by the eccentric and extending beyond the end of the shaft, saidcrank pin having its axis parallel to and offset from the axis of theeccentric whereby rotary adjustment of the eccentric will vary the throwof the crank pin about the axis 0f the shaft, and a connecting rod fortransmitting movement from the crank pin to the indenting tool.

CORWIN W. BAKER.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 855,401 Hadaway May 28, 1907860,377 Heys July 16, 1907 15 1,003,451 Hadaway Sept. 19, 1911 1,839,571McCall Jan. 5, 1932 2,048,073 Keall July 21, 1936 2,105,388 Woodcock eta1 Jan. 11, 1938 2,358,787

Booth Sept. 26, 1944

